TiDB Operator: Design & Implemention Presented by Yecheng Fu (@cofyc) PingCAP.com Agenda ● TiDB Operator 简介 ● 扩展 Kubernetes 的几种方式 ● TiDB Operator 实现 TiDB Operator 是什么 PingCAP.com Cloud Native Scaling - Handle network, hardware failures, etc. - Backup/Restore/Data migration - ... TiDB Operator TiDB PingCAP.com Kubernetes Pattern - Declarative Model - 用户描述自己的期望，提交给 Kubernetes API Server implemented TiDB Operator Kubernetes Pattern - Declarative Model PingCAP.com Operator Pattern - Extending Kubernetes TiDB Operator TiDB PD API Kubernetes API PingCAP.com Operator Pattern - Custom

Operator Pattern：用 Go 扩展 K8s 的最佳实践 吴学强 ApeCloud KubeBlocks Maintainer & 研发总监 目 录 认识我们 00 什么是 Operator 01 Operator 基础模型 02 Operator 最佳实践 03 我们是谁 云猿生（ApeCloud）是一家提供数据库内核与管理平台的基 础软件开发商. KubeBlocks 从被收购到卷王（si） 回到初（qi）心（dian） KubeBlocks Maintainer & 研发总监 free6om 什么是 Operator 第一部分 Operator 前世今生 TPR Operator CRD Operator Pattern 2015.11 2016.12 2017.12 Now K8s 1.1 版本中正式推出 TPR （ThirdPartyResource），首次尝 K8s API 的扩展性问题， 但存在诸多问题，Alpha 阶段既 夭折 CoreOS 提出 Operator 概念，用 于管理和运行基于应用程序领 域的复杂有状态应用程序。 给出了用 TPR + controller- runtime 早期版本的 sample： etcd operator K8s 1.9 版本发布，CRD进入 beta 阶段并正式取代 TPR； controller-runtime

overview of what the poster reports on. Title: Pipeline architectures in C++: overloaded pipe operator | std::expected and its monadic operations Brief overview: Functional programming in C++ is the overloaded pipe operator. In this poster I show how to implement a custom pipeline framework that employs std::expected, available since C++23. An overloaded custom pipe operator | will be presented my book about C++ [1][3]. One of the topics was to describe the behavior of the overloaded pipe operator | in std::ranges. I came across Ankur's Satle lecture [4] and decided to expand on this topic –

Pablo Halpern, 2021 (CC BY 4.0) 10Minimizing the divide between builtin and user-defined types ■ Operator overloading allows the syntax for assigning, comparing, and streaming a std::string to be the same function auto room_temp = celsius(20.0);So, aren't UDLs just syntactic sugar? ■ You betcha! ■ So is operator overloading. ■ So are infix operators in general! – a+b is just syntactic sugar for plus(a, b) obfuscate, just as operator overloading can! 10/26/21 Pablo Halpern, 2021 (CC BY 4.0) 15DEFINING A UDL SUFFIX 10/26/21 Pablo Halpern, 2021 (CC BY 4.0) 16The UDL operator ■ operator""_udl defines a UDL

begin(); auto __end1 = __range1.end(); for(; operator!=(__begin1, __end1); __begin1.operator++()) { int const & v = __begin1.operator*(); cout.operator<<(v).operator<<(endl); } } { // for (const auto& v : begin(); auto __end1 = __range1.end(); for(; operator!=(__begin1, __end1); __begin1.operator++()) { int const & v = __begin1.operator*(); cout.operator<<(v).operator<<(endl); } } 1 2 3 4 5 6 7 8 9 10 11 begin(); auto __end1 = __range1.end(); for(; operator!=(__begin1, __end1); __begin1.operator++()) { int const & v = __begin1.operator*(); cout.operator<<(v).operator<<(endl); } } { // for (const auto& v :

noexcept = default; 8 constexpr extents(const extents &) noexcept = default; 9 constexpr extents& operator =( const extents &) noexcept = default; 10 11 template 12 constexpr , rank_dynamic () >&) noexcept; 17 template 18 constexpr extents& operator =( const extents < OtherExtents ... >&) noexcept; 19 20 // [mdspan.extents.obs], Observers of the &) noexcept; 10 11 constexpr mapping& operator =( const mapping &) noexcept = default; 12 template constexpr mapping& operator =( const mapping &) noexcept;

s } { if( w.pr ) pr = new Resource( *w.pr ); } // Copy assignment operator Widget& operator=( Widget const& w ) { } // … }; 1 2 3 4 5 6 7 8 9 10 11 12 13 s } { if( w.pr ) pr = new Resource( *w.pr ); } // Copy assignment operator Widget& operator=( Widget const& w ) { return *this; } // … }; 1 2 3 4 5 6 s } { if( w.pr ) pr = new Resource( *w.pr ); } // Copy assignment operator Widget& operator=( Widget const& w ) { i = w.i; return *this; } // … };

Transitivity ∀ a, b, c, if (a == b)==true and (b == c)==true => (a == c)==true The type must work with operator== and the result should have standard semantics.2023 Victor Ciura | @ciura_victor - Regular judgement”2023 Victor Ciura | @ciura_victor - Regular, Revisited 75 Slide Title Three-way comparison operator <=> 🛸 C++20 Bringing consistent comparison operations... (a <=> b) < 0 if a < b (a <=> b) equal/equivalent2023 Victor Ciura | @ciura_victor - Regular, Revisited 76 Slide Title Three-way comparison operator <=> 🛸 C++20 The comparison categories for: It's all about relation strength 🔥2023 Victor

current_outer); [[nodiscard]] reference operator*() const; inner_iterator& operator++(); [[nodiscard]] inner_iterator operator++(int) [[nodiscard]] bool operator==(inner_iterator const& rhs) const; current_outer); [[nodiscard]] reference operator*() const; inner_iterator& operator++(); [[nodiscard]] inner_iterator operator++(int) [[nodiscard]] bool operator==(inner_iterator const& rhs) const; [[nodiscard]] reference operator*() const; 16 inner_iterator& operator++(); 17 [[nodiscard]] inner_iterator operator++(int) 18 [[nodiscard]] bool operator==(inner_iterator const& rhs)

function return Another copy during assignment operator13 David Olsen — Back to Basics: Move Semantics — CppCon 2020 #include Assignment operator dictionary = build_dictionary(getCustomerDb()); “z” : “9”14 David Olsen — Back to Basics: Move Semantics — CppCon 2020 #include Assignment operator dictionary = build_dictionary(getCustomerDb()); Destroy old value Copy dictionary return value “z” : “9”15 David Olsen — Back to Basics: Move Semantics — CppCon 2020 #include Assignment operator dictionary = build_dictionary(getCustomerDb()); Destroy old value Copy dictionary return value